Homeroom Warm Up 10/17/17 The thing I wish other people would understand about me is….. Also include why you would like other people to understand this.

CNN 10 10/17/17 What topic/topics did you find interesting? Write down some key facts back segment. What are your thoughts on the segment. What would you still like to know about this topic. *Take good notes as the segment plays so that you are able to write a 1 page summary.

Intervention Assignment 10/17/17 Writing Time Write a one page summary of your book to turn in to class tray. Use the below questions to guide your writing. What is the significance of the title? Would you have given the book a different title? If yes, what is your title? What was the book generally about? What scene resonated most with you personally in either a positive or negative way? Why? Did any of the characters remind you of yourself or someone you know? How? Would you recommend this book to a friend to read? Why or Why not?

Science Warm Up 10/17/17 Technology developed for the space program has resulted in both intended and unintended benefits. Which of these is the most likely intended benefit of Hubble Space Telescope technology? A lenses that filter dangerous light that comes from the sun B video headsets that magnify people’s views of their surroundings C cordless, rechargeable remote-controlled devices D detailed, sharp images of distant objects in the universe

Homework Remember page 29 in textbook is due on tomorrow. No exceptions. You must answer questions 1-9 on a loose leaf sheet of paper. Homework will be collected so do not put in your Science notebook.

Simple Machines GLE 0707.11.1 Identify six types of simple machines.

Machine – a tool that helps us do work Machines help us by: Changing the amount of force on an object. Changing the direction of the force.

Using a Machine to do Work Work you do on a machine is called work input (input force). Work done by the machine on an object is called work output (output force). Work=Force x Distance

Why Use a Machine? Machines do not increase the amount of work done because the work output is never greater than the work input. Machines allow force to be applied over a greater distance, which means that less force will be needed for the same amount of work. So….same work, but less force!!!

Higher the MA=easier work Mechanical Advantage Some machines make work easier than others do because they can increase force more than other machines can. Mechanical advantage is the number of times the machine multiplies force. Higher the MA=easier work

Formula for Mechanical Advantage MA= output force/input force Example: A grocer uses a handcart to lift a heavy stack of canned food. Suppose he applies an input force of 40 N to the handcart. The cart applies an output force of 320 N to the stack of canned food. What is the MA of the cart?

Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.

Six Common Simple Machines Lever Pulley Wheel & Axle Wedge Inclined Plane Screw Simple machines – have few or no moving parts

Example: seesaw, crowbar, baseball bat, rake Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight. Levers are used to apply a force to a load. There are three classes of levers, which are based on the placements of the fulcrum, the load, and the input force. Example: seesaw, crowbar, baseball bat, rake

First Class Lever- a first-class lever, the fulcrum is between the input force and the load . Common examples of first-class levers include crowbars, scissors, pliers, tin snips and seesaws.

Second Class Lever-The load of a second-class lever is between the fulcrum and the input force Examples of second-class levers include nut crackers, wheel barrows, doors, and bottle openers.

Third Class Lever-The input force in a third-class lever is between the fulcrum and the load. Examples of third-class levers include tweezers, arm hammers, and shovels.

Inclined Plan – a slanted surface to make lifting easier Example: ramp, stairs

Example: knife, door wedge, ax Wedge – two inclined planes together used to raise an object or split an object. Example: knife, door wedge, ax

Example: drill bit, screws Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. Example: drill bit, screws

Example: steering wheel, doorknob, screwdriver Wheel and Axle – a wheel that turns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver

Example : flagpole, clothesline, cranes, fishing reel Pulley – made of rope and string wound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel

Compound Machine – two or more simple machines working together. Examples: Bike Car

Science Closure 10/17/17 A logger splits a piece of wood. What simple machine splits the wood? A wedge B wheel and axle C pulley D lever